ELLSWORTH, Maine — A city man has pleaded guilty to a string of drug-related charges that began last summer when police tailed him to Aroostook County where he picked up $3,400 worth of the prescription painkiller oxycodone.

Craig Strout-Desmond, 25, pleaded guilty Monday in Hancock County Superior Court to unlawful trafficking of a scheduled drug, unlawful possession of oxycodone, unlawful possession of synthetic hallucinogens and violation of conditions of release.

Strout-Desmond has applied for alternative sentencing through Hancock County Adult Drug Treatment Court.

He is being held in Hancock County Jail until Friday, when the drug court will decide whether he qualifies for the program, which offers deferred sentencing contingent on satisfactory participation in the rehabilitation regime.

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The charges stemmed from three separate incidents, beginning with the trafficking charge. In August 2011, following a tip from a state trooper that Strout-Desmond and his girlfriend were bound for Aroostook County to make a drug pickup, agents from Maine Drug Enforcement Agency followed the couple to the Orient home of Strout-Desmond’s grandfather, Robert Strout, and back into Ellsworth again.

Agents stopped the couple around midnight and searched the vehicle, in which they found a bag containing 170 10-milligram oxycodone tablets with a street value of $3,400, according to MDEA.

In January 2012, police found Strout-Desmond in possession of oxycodone and the synthetic hallucinogenic known as bath salts. Later, in February, Strout-Desmond was charged with violating bail after admitting to Ellsworth police that he had used Suboxone, a synthetic drug used to treat opiate addicts, and oxycodone.

If the drug court denies his application for alternative sentencing, Strout-Desmond will face normal sentencing. Trafficking oxycodone, a Class B crime, carries a sentence of up to 10 years in prison and a penalty of up to $20,000.